Need help finding the title of a movie?

Basically, I remember watching this film roughly 8 years ago on the channel Syfy. Now, I want to know what is the title, here is what I remember about the film. A soldier goes to this warehouse or building, afterward finds an alien, but the alien looks exactly like a female. The alien is just sitting there with her alien transmitter (I think). Later the soldier takes the alien home, he takes his eyes of her, and the alien transforms to a different kind of female. This process keeps continuing as she keeps transforming into different races of females. The ending, I quite do not remember, but he goes with her to her home planet on a spaceship and that is about it. Thanks.